⑴Linux系统操作中，有时会不小心删除重要文件，而能够恢复删除文件的软件有很多，extgrep就是其中的一种，extgrep在使用中需要用到不少命令，下面小编就给大家介绍下Linux使用extgrep的方法。
⑵目前的最新版本是：extgrep-...tar.gz
⑶我系统的环境是：虚拟机
⑷［rootlocalhost bin］# uname -a
⑸Linux localhost.localdomain ..-.el # SMP Tue Aug :: EDT i i i GNU/Linux
⑹［rootlocalhost bin］# cat /etc/issue
⑺Red Hat Enterprise Linux Server release . （Tikanga
⑻tar zxvf extgrep-...tar.gz
⑼cd extgrep-..
⑽。/configure --prefix=/usr/local/extgrep
⑾make install
⑿然后进入么安装目录看一下，只有一个bin
⒀［rootlocalhost extgrep］# pwd
⒁/usr/local/extgrep
⒂［rootlocalhost extgrep］# ls
⒃进到bin里面看一下
⒄［rootlocalhost extgrep］# cd bin
⒅［rootlocalhost bin］# ls
⒆我们可以看一下帮助，下面是部分
⒇［rootlocalhost bin］# 。/extgrep -h
⒈Running extgrep version ..
⒉。/extgrep： invalid option -- h
⒊No action specified; implying --superblock.
⒋Usage： 。/extgrep ［options］ ［--］ device-file
⒌Options：
⒍--version， -［vV］ Print version and exit suessfully.
⒎--help， Print this help and exit suessfully.
⒏--superblock Print contents of superblock in addition to the rest.
⒐If no action is specified then this option is implied.
⒑--print Print content of block or inode， if any.
⒒--ls Print directories with only one line per entry.
⒓This option is often needed to turn on filtering.
⒔--aept filen Aept ‘filen’ as a legal filename. Can be used multi-
⒕ple times. If you change any --aept you must remove
⒖BOTH stage* files！
⒗--aept-all Simply aept everything as filename.
⒘--journal Show content of journal.
⒙--show-path-inodes Show the inode of each directory ponent in paths.
⒚Filters：
⒛--group grp Only process group ‘grp’。
①--directory Only process directory inodes.
②--after dtime Only entries deleted on or after ‘dtime’。
③--before dtime Only entries deleted before ‘dtime’。
④--deleted Only show/process deleted entries.
⑤--allocated Only show/process allocated inodes/blocks.
⑥--unallocated Only show/process unallocated inodes/blocks.
⑦--reallocated Do not suppress entries with reallocated inodes.
⑧Inodes are considered ‘reallocated’ if the entry
⑨is deleted but the inode is allocated， but also when
⑩the file type in the dir entry and the inode are
Ⅰdifferent.
Ⅱ--zeroed-inodes Do not suppress entries with zeroed inodes. Linked
Ⅲentries are always shown， regardless of this option.
Ⅳ--depth depth Process directories recursively up till a depth
Ⅴof ‘depth’。
ⅥActions：
Ⅶ--inode-to-block ino Print the block that contains inode ‘ino’。
Ⅷ--inode ino Show info on inode ‘ino’。
ⅨIf --ls is used and the inode is a directory， then
Ⅹthe filters apply to the entries of the directory.
㈠If you do not use --ls then --print is implied.
㈡--block blk Show info on block ‘blk’。
㈢If --ls is used and the block is the first block
㈣of a directory， then the filters apply to entries
㈤of the directory.
㈥If you do not use --ls then --print is implied.
㈦--histogram=［atime|ctime|mtime|dtime|group］
㈧Generate a histogram based on the given specs.
㈨Using atime， ctime or mtime will change the
㈩meaning of --after and --before to those times.
--journal-block jblk Show info on journal block ‘jblk’。
--journal-transaction seq
Show info on transaction with sequence number ‘seq’。
--dump-names Write the path of files to stdout.
This implies --ls but suppresses it‘s output.
--search-start str Find blocks that start with the fixed string ’str‘。
--search str Find blocks that contain the fixed string ’str‘。
--search-inode blk Find inodes that refer to block ’blk‘。
--search-zeroed-inodes Return allocated inode table entries that are zeroed.
--inode-dirblock-table dir
Print a table for directory path ’dir‘ of directory
block numbers found and the inodes used for each file.